Campbell Scientific LoggerNet Datalogger Support Software - Manual (Page 469)

Section 14. Troubleshooting Guide
assume you have a Hayes-compatible modem and an array-based datalogger on
a phone link with the phone number “752-7779”. You could test the link with
the following sequence:
Type ATH <Enter> To hang up the modem. You should see an “OK” on the
screen sent by the modem. If you do not, perhaps there is
no modem attached to that COM port or perhaps the
modem is not powered on.
Type AT&F
<Enter>
To put a typical Hayes-style modem back to the factory
defaults. You should see an “OK” echoed by the modem.
If you do not, perhaps it’s not a Hayes-compatible modem.
For example, many U.S. Robotics modems require
“AT&F1”. Older 1200 baud modems may require “ATZ”.
Type AT&C1&D2
<Enter>
To cause the modem to use hardware flow control and
report the loss of the carrier when the datalogger hangs up
its modem. You should see “OK” appear on the screen. If
you see “ERROR”, then the modem doesn’t recognize one
or both of the “&C1” or “&D2” commands.
Type AT\J1 <Enter> To force the modem to follow the serial port rate rather than
try to connect at the fastest rate the remote modem will
support. You should see “OK” appear on the screen. If you
see “ERROR”, then the modem doesn’t recognize this
command.
Type ATDT752777
9 <Enter>
To dial, using tone dialing, a datalogger at “7527779”. You
should hear a dial tone, followed by a series of beeps and
tones, followed by what sounds like white noise or
scratching sounds and screeches. When the modems
connect, you should see the word, “CONNECT”, appear on
the screen, perhaps followed by information about the
speed and type of connection. If you don’t hear a dial tone,
perhaps you haven’t plugged in the telephone line or the
line is not operational. If you hear the dial tone and the
beeps of the phone number being dialed, but there’s no ring
on the other end, perhaps the number isn’t valid or you
didn’t “get an outside line”. If a person answers, perhaps
you have the wrong phone number. If it rings, and answers
with tones and screeches, but you don’t get a “CONNECT”
message, perhaps you have dialed a fax number, or other
data modem, but not one with a datalogger attached or the
datalogger is the wrong type.
Type <Enter>
<Enter>
<Enter>
about 2–3
seconds apart
To send carriage return characters to the array-based
datalogger. If the datalogger recognizes these characters, it
will send back an asterisk, “ * “ for every <Enter>
keystroke. If it does not, perhaps it’s not an array-based
datalogger, or you’ve chosen a baud rate that’s too high for
the datalogger or the quality of the phone line is too poor to
support that baud rate.
Type A <Enter> You should see a string of characters from the datalogger
that report its status, including final storage pointers,
memory size, perhaps lithium battery voltage, and internal
error counters. If you do not, then the phone line may be
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